{{this article is about|obex portion of the brain. For the communications protocol "OBEX" (Object Exchange), see [[OBEX]]}}

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The '''obex''' (from the [[Latin language|Latin]] for ''barrier'') is the point in the [[human brain]] at which the [[fourth ventricle]] narrows to become the [[central canal]] of the [[spinal cord]]. The obex occurs in the [[Anatomical terms of location|caudal]] [[medulla oblongata|medulla]].The decussating of sensory fibers happens at this point.

The '''obex''' (from the [[Latin language|Latin]] for ''barrier'') is the point in the [[human brain]] at which the [[fourth ventricle]] narrows to become the [[central canal]] of the [[spinal cord]]. The obex occurs in the [[Anatomical terms of location|caudal]] [[medulla oblongata|medulla]].The decussating of sensory fibers happens at this point.